<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.HashMap" %><%--
  Created by IntelliJ IDEA.
  User: WuLiangHang
  Date: 2021/12/20
  Time: 11:51
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    request.setAttribute("emptyNull", null);
    request.setAttribute("str", "");
    request.setAttribute("arr", new Object[]{});
    request.setAttribute("list", new ArrayList<String>());
    request.setAttribute("map", new HashMap<String, Object>());
%>
${empty emptyNull}<br/>
${empty str}<br/>
${empty arr}<br/>
${empty list}<br/>
${empty map}<br/>
</body>
</html>
